Visio: Creating new connectors in a straight line

[collinsc]

Hi

I am creating a diagram; I have 2 boxes and one arrow between them.

I now need to add another arrow beneath it parallel, say about 2 millimetres below.

I have added new connection points but i am not able to get the connection points to be at the same height on the 2 boxes, meaning i cannot make the line parallel.

Is there a way to ensure you add connection points at the same height? Is there an auto-straighten function?

Advice appreciated!

Thanks